Make lost context callback a base::Closure thru the WGC3DProvider.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBufferTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 #include "gpu/command_buffer/client/gles2_interface_stub.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "platform/graphics/test/MockWebGraphicsContext3D.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebExternalTextureMailbox.h"
 #include "public/platform/WebGraphicsContext3D.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
+#include "public/platform/callback/WebClosure.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/RefPtr.h"
 
 using testing::Test;
 using testing::_;
 
 namespace blink {
 
 namespace {
@@ skipping 214 matching lines @@
     WebGraphicsContext3DProviderForTests(PassOwnPtr<WebGraphicsContext3D> context, PassOwnPtr<gpu::gles2::GLES2Interface> gl)
         : m_context(std::move(context))
         , m_gl(std::move(gl))
     {
     }
 
     WebGraphicsContext3D* context3d() override { return m_context.get(); }
     gpu::gles2::GLES2Interface* contextGL() override { return m_gl.get(); }
     // Not used by WebGL code.
     GrContext* grContext() override { return nullptr; }
+    void setLostContextCallback(WebClosure) {}
 
 private:
     OwnPtr<WebGraphicsContext3D> m_context;
     OwnPtr<gpu::gles2::GLES2Interface> m_gl;
 };
 
 class DrawingBufferTest : public Test {
 protected:
     void SetUp() override
     {
@@ skipping 525 matching lines @@
     m_drawingBuffer->markContentsChanged();
     EXPECT_TRUE(m_drawingBuffer->prepareMailbox(&mailbox, 0));
     EXPECT_EQ(initialSize, webContext()->mostRecentlyProducedSize());
     EXPECT_FALSE(mailbox.allowOverlay);
 
     m_drawingBuffer->mailboxReleased(mailbox, false);
     m_drawingBuffer->beginDestruction();
 }
 
 } // namespace blink